Author: Chris Gebhardt / Source: nasaspaceflight.com
With a mission that was anything but mundane, Soyuz MS-09 with its three-person crew returned to Earth after more than 6 months in orbit on the International Space Station. The Soyuz MS-09 vehicle rose to high public profile in August when a hole that resulted in a small atmospheric leak aboard the Station was discovered in its Orbital Module.
That hole was determined to have been drilled on the ground during the spacecraft’s manufacturing and led to a rather dramatic spacewalk earlier in December that saw cosmonauts cut into the protective casing around MS-09’s Orbital Module to conduct further investigation of the issue.
Wrapping up its mission, Soyuz MS-09 and its three-person crew from Russia, ESA, and NASA, undocked from the International Space Station at 20:42 EST (01:42 UTC on Thursday, 20 December) before landing on the Kazakh steppe at around 00:03 EST (0503 UTC) on Thursday, 20 December.
Soyuz MS-09 – a profile in intrigue:
When Soyuz MS-09 launched to the Space Station on 6 June 2018, the mission seemed like most others that had come before: nominal in almost every regard with the spacecraft successfully delivering its three-person crew to the International Space Station.
The crewed Soyuz transportation vehicles are comprised of three primary sections, the Orbital Module at the top which physically connects the vehicle to the International Space Station, the Descent Module in the middle within which crews ride to and from orbit, and the Instrumentation and Propulsion Module which contains the propulsion, power, electrical, and avionics systems for the craft.
At the end of nominal missions, the only part of a Soyuz spacecraft that survives reentry is the Descent Module, with the Orbital and Instrumentation and Propulsion Modules burning up during atmospheric reentry.
Once the hole was found, Station crew members immediately identified it as having been caused by a drill and reported the presence of material in the hole suggesting that is had already been sealed on the ground and that that ground seal had given way.
Over the objections of then-NASA Station Commander Drew Feustel and NASA requests to hold off on permanent repairs until an investigation and better understand of the hole was determined, Russian cosmonauts and Russian Mission Control quickly sealed the hole using an epoxy sealant.
After those repairs, no further leaks were detected aboard the Station aside from the nominal atmospheric decay that occurs during each of the Station’s 16 daily orbital day to night passes.
Official confirmation that the hole was caused by a drill was announced on 4 September 2018, though it could not be determined whether the hole was drilled intentionally during manufacturing – aka, sabotage – or was the result of a manufacturing error.
Despite the admission, what was abundantly clear…
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